[6] Don’t attempt to jump-step farther than your height. You may get lucky, but you shouldn’t risk a backcountry injury to ankles, knees, or feet.

[7] Groups should stay within visual or shouting distance, but in hazardous conditions (lightning storms, traversing avalanche chutes, etc.) spread out so that if disaster strikes, the whole group isn’t incapacitated.

[12] Study maps as a group. Make sure everyone is aware of bailout and escape routes, plus nearby roads and services that could be resources in an emergency

[13] The hikers misquoted the number of people involved in the accident (and their condition) to rescuers. Write down details like location, number of people, and injuries so that rescuers get the right info and arrive equipped.

[14] Add a loop with a Prusik knot to a main rope for easy ascending. The loop will hold weight under pressure, but slides easily when unweighted (learn the knot at backpacker.com/prusik).

[15] Folding and tripling a rope increases its weight-bearing strength. To secure yourself in a rescue collar, place it over your head, tuck it securely under your armpits, and cross your arms over your chest.

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The wave struck just after 7 a.m. Neil Peterson, his daughter Kelsey, son Guy, and their friends Joe and Tim were on day two of the West Coast Trail (WCT), a challenging 47-mile route[1] that traces Vancouver Island’s rugged Pacific shoreline.

They were hiking near the water, taking advantage of an alternative route across a flat sandstone shelf exposed by the low tide,[2] which offered an easy route between the surf and a rugged inland bluff. They’d awoken early to time the crux of their day with the low tide, so the trekkers were tired when they encountered a five-foot wide cleft in the rock, a surge channel.[3] As they pondered their options to skirt it, a sudden wave raced across the shelf.[4] They had no warning, and the water knocked all but one of the hikers into the surf inside the seething chute.[5]

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The wave pushed four of the group members inland, bashing them against floating tree trunks and the channel’s narrow walls. As the wave receded, they dropped into a pool at the channel’s terminus and climbed out of the water, into a cave under the bluff.

Regrouping inside the cave, Peterson and the drenched hikers heard a shout from the shoreline above. Just before the wave hit, their friend Joe had leapt across the surge channel[6] so that the others could throw their packs across. He’d been hauling Kelsey’s pack to high ground when the group was swept inland. Now, he was the only one who wasn’t trapped.[7]

Peterson’s group was uninjured and relatively safe. The hollow was above the tide line, but the steep walls were too high to climb and the channel too dangerous to swim. They were soaked. “Our immediate problem was hypothermia,”[8] says Peterson. Kelsey’s pack, the only one that hadn’t been dragged out to sea, contained extra clothes and a sleeping bag but no firestarter and little food.[9] Joe dropped it into the cave so the others could put on dry layers[10] while he went to find help.

“It was psychologically tough to stay put,” Peterson says, but as the morning hours dragged by, they buoyed morale by playing mental games and hatching escape plans.[11] They waited more than nine hours for Joe to return.

While Joe was gone, he got lost,[12] encountered other hikers who he sent to get help,[13] and broke into a locked ranger cabin to retrieve food and a climbing rope. When he arrived back at the cave to help Peterson and the others, he tied footholds in the rope[14] and passed it to his friends. Guy and Kelsey were able to climb to safety, but Tim and Peterson weren’t able to scale the rope. They remained stuck until dusk, when a U.S. Coast Guard helicopter arrived.

Conditions weren’t safe to use the chopper’s hoist, so USCG rescue swimmer John Linnborn improvised. He tripled and knotted a line and attached it to a U-shaped rescue collar,[15] which allowed rescuers to pull Peterson and Tim up the slimy cave walls to safety. “We were running out of daylight,” says Linnborn, “and their unique situation required creative thinking.”